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02-20-2008, 11:10 AM   #1
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DA* 50-135mm with 1.4x TC or Pentax-M 200mm F4?

What do you think would be a better option for a telephoto addition to my bag?

I noticed that buying a 1.4x TC from Tamron or Kenko would cost a bit more than the 200mm Pentax-M.

02-20-2008, 11:13 AM   #2
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QuoteOriginally posted by yeedub Quote
What do you think would be a better option for a telephoto addition to my bag? I noticed that a 1.4x TC from Tamron or Kenko would cost a bit more than the 200mm Pentax-M.
I have the DA* 50-135 and a Pentax 1.4X-S rear converter. They work very well together (somewhat to my surprise) providing very good Image Quality. With the two of them I have an autofocus 50-135 of no less than superb quality and a manual focus 75-205 (roughly) with extremely good IQ.
02-20-2008, 11:25 AM   #3
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QuoteOriginally posted by Canada_Rockies Quote
I have the DA* 50-135 and a Pentax 1.4X-S rear converter. They work very well together (somewhat to my surprise) providing very good Image Quality. With the two of them I have an autofocus 50-135 of no less than superb quality and a manual focus 75-205 (roughly) with extremely good IQ.
To confirm: does the SDM work with DA * 50-135 using the Pentax 1.4X-S rear converter?
02-20-2008, 11:58 AM   #4
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QuoteOriginally posted by gawan Quote
To confirm: does the SDM work with DA * 50-135 using the Pentax 1.4X-S rear converter?
No. It is manual focus only. The A 1.4X-S retains all the exposure stuff, and passes the lens data, but there are no contacts for the autofocus, nor is there the drive shaft for old style. It does enable "snap-in-focus" though. that's where you leave the camera in AF-S and it will only take a picture when you get a focus indication. Neat trick, particularly on moving subjects where you need to take the picture at a particular point in space.

02-20-2008, 12:05 PM   #5
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I have the Tamron 1.4x TC and it works well with the 50-135 (IQ wise). It does retain AF, but even in bright light you'll have to 'reconfirm' focus for many shots. The lens (with the TC) will focus the scene, but will blink the AF indicator. if you then take your finger off of the shutter release and then depress again, it focuses 'instantly' and you are good to go. Kind of annoying but it works. If I'm shooting something distant, I'll AF and then switch to manual so the AF system doesn't go nuts on my between shots.

I hope to try out my Pentax 1.7x TC tonight - I'm hoping it doesn't rain here!
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